80777939129 has 4 divisors (see below), whose sum is σ = 80794319076. Its totient is φ = 80761559184.

The previous prime is 80777939087. The next prime is 80777939131. The reversal of 80777939129 is 92193977708.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59650735225 + 21127203904 = 244235^2 + 145352^2 .

It is a cyclic number.

It is not a de Polignac number, because 80777939129 - 2²⁸ = 80509503673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80777939159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8182574 + ... + 8192439.

It is an arithmetic number, because the mean of its divisors is an integer number (20198579769).

Almost surely, 2^80777939129 is an apocalyptic number.

It is an amenable number.

80777939129 is a deficient number, since it is larger than the sum of its proper divisors (16379947).

80777939129 is a wasteful number, since it uses less digits than its factorization.

80777939129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16379946.

The product of its (nonzero) digits is 12002256, while the sum is 62.

The spelling of 80777939129 in words is "eighty billion, seven hundred seventy-seven million, nine hundred thirty-nine thousand, one hundred twenty-nine".